This ppt show the steps to rewind the Brushless motor(BLDC)
If you fly brushless you've probably cooked a motor or two. You also probably know there are many different types of motors. Similar motors when wound differently performs very differently. Whether you've burned the motor up, or just want to alter performance, rewinding is a cheap solution for a patient modeller.
For this tutorial, I will be using Dynam E-Razor 450 Brushless Motor 60P-DYM-0011 (2750Kv). It is a Delta wound 8T (It means 8 turns ) quad wind.
The winding pattern described in this tutorial (called an ABC wind - ABCABCABC as you go around the stator) works for any brushless motor with 9 stator teeth and 6 magnets.
Effect of Stator slots and Poles on the Design of Rotating MachineIJESM JOURNAL
Unsuitable combinations of stator and rotor slots with unsuitable number of poles generate high level of harmonic content and malfunctions of rotating machine when set into running operation. If this situation is not arrested, this could lead to the entire breakdown of machine. In rotating machine design, the stator slots must be able to run effectively with the suitable number of rotor slots so as to avoid cogging and winding vibrations. The manufacturer needs to know the level of harmonic contents of that machine to be wound in order to run a particular load. The rewinder should not rewind a stator with pole that will bring abnormal operation of that machine by considering the suitable stator slots and poles that will prevent the coil from undergoing heating effect. The winding may be symmetrical, unsymmetrical, balanced or unbalanced and these depend on the number of stator slots and the number of poles. This paper presents the effect of harmonic contents on the number of stator slots and poles of rotating machines.
solar power systems may be categorized into four primary types. These types of systems may be designed to meet all or part of the user's electrical requirements. Check out the links: http://renewenergy.com.au/
Effect of Stator slots and Poles on the Design of Rotating MachineIJESM JOURNAL
Unsuitable combinations of stator and rotor slots with unsuitable number of poles generate high level of harmonic content and malfunctions of rotating machine when set into running operation. If this situation is not arrested, this could lead to the entire breakdown of machine. In rotating machine design, the stator slots must be able to run effectively with the suitable number of rotor slots so as to avoid cogging and winding vibrations. The manufacturer needs to know the level of harmonic contents of that machine to be wound in order to run a particular load. The rewinder should not rewind a stator with pole that will bring abnormal operation of that machine by considering the suitable stator slots and poles that will prevent the coil from undergoing heating effect. The winding may be symmetrical, unsymmetrical, balanced or unbalanced and these depend on the number of stator slots and the number of poles. This paper presents the effect of harmonic contents on the number of stator slots and poles of rotating machines.
solar power systems may be categorized into four primary types. These types of systems may be designed to meet all or part of the user's electrical requirements. Check out the links: http://renewenergy.com.au/
Solar power sector: Technology, BoS, Pre Feasbility and phase of project dev...Ashish Verma
Key Solar PV technology and future perspective, penetration
Trend in Balance of system, cost projection
Step to make the project bankable, Pre-feasibility for solar
Phase of Solar Project development inUtility scale segment
Credit: Bhuwan Mehta, PwC
Gensol Consultants
IRENA, IRELP, AMPSolar
Gensol collected Actual Global Tilted Irradiation (AGTI) of 57 sites from operational projects spread across in India. It was then correlated with Expected Global Tilted Irradiation (EGTI) from the following meteo-databases namely:
1) Meteonorm-7.2
2) SolarGIS,
3) NASA (National Aeronautics and Space Administration),
4) NREL (National Renewable Energy Laboratory)
In our report, we find most representative meteo-data set for each site.
THOMAS E.BEARDEN has invented and patented in 2002 by a group led by Bearden a free energy device called “MEG” .
This device transforms the magnetic force of a permanent magnet into electricity and achieves over unity.
Design and Implementation of a Solar Power Systemijtsrd
Energy is a very important variable that its conservation is of paramount interest to engineers of our time. As we know, the law of conservation of energy states that energy can neither be created nor destroyed, but it can be transformed from one form to another. This helps in sustainable use and protection of natural resources. This research work the Design and Implementation of a Solar Power System focuses on a technique of power generation from solar source. It provides simple basic theoretical studies of solar cell and its modelling techniques using equivalent electric circuits. Solar Photovoltaic PV power generation system is comprising several elements like solar cells, inverter, Battery charge controller and single phase inverter for AC loads are implemented in hardware in simple manner. Sylvester Emeka Abonyi | Kingsley Chibueze Obute | Anthony Amaechi Okafor "Design and Implementation of a Solar Power System" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-6 | Issue-3 , April 2022, URL: https://www.ijtsrd.com/papers/ijtsrd49926.pdf Paper URL: https://www.ijtsrd.com/engineering/mechanical-engineering/49926/design-and-implementation-of-a-solar-power-system/sylvester-emeka-abonyi
This ppt show the steps to rewind the Brushless motor(BLDC)
If you fly brushless you've probably cooked a motor or two. You also probably know there are many different types of motors. Similar motors when wound differently performs very differently. Whether you've burned the motor up, or just want to alter performance, rewinding is a cheap solution for a patient modeller.
For this tutorial, I will be using Dynam E-Razor 450 Brushless Motor 60P-DYM-0011 (2750Kv). It is a Delta wound 8T (It means 8 turns ) quad wind.
The winding pattern described in this tutorial (called an ABC wind - ABCABCABC as you go around the stator) works for any brushless motor with 9 stator teeth and 6 magnets.
Solar power sector: Technology, BoS, Pre Feasbility and phase of project dev...Ashish Verma
Key Solar PV technology and future perspective, penetration
Trend in Balance of system, cost projection
Step to make the project bankable, Pre-feasibility for solar
Phase of Solar Project development inUtility scale segment
Credit: Bhuwan Mehta, PwC
Gensol Consultants
IRENA, IRELP, AMPSolar
Gensol collected Actual Global Tilted Irradiation (AGTI) of 57 sites from operational projects spread across in India. It was then correlated with Expected Global Tilted Irradiation (EGTI) from the following meteo-databases namely:
1) Meteonorm-7.2
2) SolarGIS,
3) NASA (National Aeronautics and Space Administration),
4) NREL (National Renewable Energy Laboratory)
In our report, we find most representative meteo-data set for each site.
THOMAS E.BEARDEN has invented and patented in 2002 by a group led by Bearden a free energy device called “MEG” .
This device transforms the magnetic force of a permanent magnet into electricity and achieves over unity.
Design and Implementation of a Solar Power Systemijtsrd
Energy is a very important variable that its conservation is of paramount interest to engineers of our time. As we know, the law of conservation of energy states that energy can neither be created nor destroyed, but it can be transformed from one form to another. This helps in sustainable use and protection of natural resources. This research work the Design and Implementation of a Solar Power System focuses on a technique of power generation from solar source. It provides simple basic theoretical studies of solar cell and its modelling techniques using equivalent electric circuits. Solar Photovoltaic PV power generation system is comprising several elements like solar cells, inverter, Battery charge controller and single phase inverter for AC loads are implemented in hardware in simple manner. Sylvester Emeka Abonyi | Kingsley Chibueze Obute | Anthony Amaechi Okafor "Design and Implementation of a Solar Power System" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-6 | Issue-3 , April 2022, URL: https://www.ijtsrd.com/papers/ijtsrd49926.pdf Paper URL: https://www.ijtsrd.com/engineering/mechanical-engineering/49926/design-and-implementation-of-a-solar-power-system/sylvester-emeka-abonyi
This ppt show the steps to rewind the Brushless motor(BLDC)
If you fly brushless you've probably cooked a motor or two. You also probably know there are many different types of motors. Similar motors when wound differently performs very differently. Whether you've burned the motor up, or just want to alter performance, rewinding is a cheap solution for a patient modeller.
For this tutorial, I will be using Dynam E-Razor 450 Brushless Motor 60P-DYM-0011 (2750Kv). It is a Delta wound 8T (It means 8 turns ) quad wind.
The winding pattern described in this tutorial (called an ABC wind - ABCABCABC as you go around the stator) works for any brushless motor with 9 stator teeth and 6 magnets.
working principle of alternators and its kind _What you've just experienced is an example of an alternator breathing its last breath.
Your first thought might have been the battery is dying. In a sense, you would be right because the battery and the alternator are related, but the battery tends to get all the press.
This presentation aims to explain the mechanics of alternators, how you can diagnose problems and what you can do if you have a bad alternator.
You will come to now to some background information about alternators and the war of the currents.
TEACHING AND LEARNING BASED OPTIMISATIONUday Wankar
Teaching–Learning-Based Optimization (TLBO) seems to be a rising star from amongst a number of metaheuristics with relatively competitive performances. It is reported that it outperforms some of the well-known metaheuristics regarding constrained benchmark functions, constrained mechanical design, and continuous non-linear numerical optimization problems. Such a breakthrough has steered us towards investigating the secrets of TLBO’s dominance. This report’s findings on TLBO qualitatively and quantitatively through code-reviews and experiments, respectively.
It is a selection of best element (with regard to some criteria) from some set of available alternatives. In the simplest case, an optimization problem consist of maximizing or minimizing a real function by choosing input values from within an allowed set and computing the value of function. The classical optimization techniques are useful in finding the optimum solution or unconstrained maxima or minima of continuous and differentiable functions. These are analytical methods and make use of differential calculus in locating the optimum solution. The classical methods have limited scope in practical applications as some of them involve objective functions which are not continuous and un-differentiable. Yet, the study of these classical techniques of optimization form a basis for developing most of the numerical techniques that have evolved into advanced techniques more suitable to today’s practical problems.
The difficulties associated with using mathematical optimization on large-scale engineering problems have contributed to the development of alternative solutions. Linear programming and dynamic programming techniques, for example, often fail (or reach local optimum) in solving NP-hard problems with large number of variables and non-linear objective functions. To overcome these problems, researchers have proposed evolutionary-based algorithms for searching near-optimum solutions to problems.
Evolutionary algorithms (EAs) are stochastic search methods that mimic the metaphor of natural biological evolution and/or the social behaviour of species. Examples include how ants find the shortest route to a source of food and how birds find their destination during migration. The behaviour of such species is guided by learning, adaptation, and evolution. To mimic the efficient behaviour of these species, various researchers have developed computational systems that seek fast and robust solutions to complex optimization problems. The first evolutionary-based technique introduced in the literature was the genetic algorithms (Gas). GAs were developed based on the Darwinian principle of the ‘survival of the fittest’ and the natural process of evolution through reproduction. Based on its demonstrated ability to reach near-optimum solutions to large problems, the GAs technique has been used in many applicationsin science and engineering. Despite their benefits, GAs may require long processing time for a near optimum solution to evolve. Also, not all problems lend themselves well to a solution with GAs.
For three decades, many mathematical programming methods have been developed to solve optimization problems. However, until now, there has not been a single totally efficient and robust method to coverall optimization problems that arise in the different engineering fields.Most engineering application design problems involve the choice of design variable values that better describe the behaviour of a system.At the same time, those results should cover the requirements and specifications imposed by the norms for that system. This last condition leads to predicting what the entrance parameter values should be whose design results comply with the norms and also present good performance, which describes the inverse problem.Generally, in design problems the variables are discreet from the mathematical point of view. However, most mathematical optimization applications are focused and developed for continuous variables. Presently, there are many research articles about optimization methods; the typical ones are based on calculus,numerical methods, and random methods.
The calculus-based methods have been intensely studied and are subdivided in two main classes: 1) the direct search methods find a local maximum moving a function over the relative local gradient directions and 2) the indirect methods usually find the local ends solving a set of non-linear equations, resultant of equating the gradient from the object function to zero, i.e., by means of multidimensional generalization of the notion of the function’s extreme points from elementary calculus given smooth function without restrictions to find a possible maximum which is to be restricted to those points whose slope is zero in all directions. The real world has many discontinuities and noisy spaces, which is why it is not surprising that the methods depending upon the restrictive requirements of continuity and existence of a derivative, are unsuitable for all, but a very limited problem domain. A number of schemes have been applied in many forms and sizes. The idea is quite direct inside a finite search space or a discrete infinite search space, where the algorithms can locate the object function values in each space point one at a time. The simplicity of this kind of algorithm is very attractive when the numbers of possibilities are very small. Nevertheless, these outlines are often inefficient, since they do not complete the requirements of robustness in big or highly-dimensional spaces, making it quite a hard task to find the optimal values. Given the shortcomings of the calculus-based techniques and the numerical ones the random methods have increased their popularity.
Finding an alternative with the most cost effective or highest achievable performance under the given constraints, by maximizing desired factors and minimizing undesired ones. It also mean that it make best use of a situation or resource. In comparison, maximization means trying to attain the highest or maximum result or outcome without regard to cost or expense. Practice of optimization is restricted by the lack of full information, and the lack of time to evaluate what information is available (see bounded reality for details). In computer simulation (modeling) of business problems, optimization is achieved usually by using linear programming techniques of operations research.
The first ant colony optimization (ACO) called ant system was inspired through studying of the behaviour of ants in 1991 by Macro Dorigo and co-workers. An ant colony is highly organized, in which one interacting with others through pheromone in perfect harmony. Optimization problems can be solved through simulating ant’s behaviours. Since the first ant system algorithm was proposed, there is a lot of development in ACO. In ant colony system algorithm, local pheromone is used for ants to search optimum result. However, high magnitude of computing is its deficiency and sometimes it is inefficient. Thomas Stützle etal. Introduced MAX-MIN Ant System (MMAS) in 2000. It is one of the best algorithms of ACO. It limits total pheromone in every trip or sub-union to avoid local convergence. However, the limitation of pheromone slows down convergence rate in MMAS.
The gas turbine is an internal combustion engine that uses air as the working fluid. The engine extracts chemical energy from fuel and converts it to mechanical energy using the gaseous energy of the working fluid (air) to drive the engine and propeller, which, in turn, propel the aeroplane.
The gas turbine is an internal combustion engine that uses air as the working fluid. The engine extracts chemical energy from fuel and converts it to mechanical energy using the gaseous energy of the working fluid (air) to drive the engine and propeller, which, in turn, propel the airplane.
Our project is a persistence of vision display (POV) that spins 360 degrees horizontally. The purpose of our POV display project is to create a small apparatus that will create a visual using only a small number of LEDs as it spins in a circle. When the LEDs rotate several times around a point in less than a second, the human eye reaches its limit of motion perception and creates an illusion of a continuous image. Therefore, our POV display demonstrates this phenomenon by creating a visual as the LEDs spin rapidly in a circle and the person watching will see one continuous image.
Arm cortex (lpc 2148) based motor speedUday Wankar
The project is designed to control the speed of a DC and AC motor using an
ARM7 LPC2148 processor. The speed of motor is directly proportional to the voltage
applied across its terminals. Hence, if voltage across motor terminal is varied, then
speed can also be varied. This project uses the above principle to control the speed of
the motor by varying the duty cycle of the pulses applied to it, popularly known as
PWM control. The project uses input button interfaced to the processor, which are
used to control the speed of motor. Pulse Width Modulation is generated at the output
by the microcontroller as per the program. The program is written in Embedded C.
The average voltage given or the average current flowing through the motor
will change depending on the duty cycle, ON and OFF time of the pulses, so the speed
of the motor will change. A motor driver IC is interfaced to the ARM7 LPC2148
processor board for receiving PWM signals and delivering desired output for speed
control. Further the project can be enhanced by using power electronic devices such
as IGBTs to achieve speed control higher capacity industrial motors.
Arm Processor Based Speed Control Of BLDC MotorUday Wankar
The project is designed to control the speed of a DC motor using an ARM series processor. The speed of DC motor is directly proportional to the voltage applied across its terminals. Hence, if voltage across motor terminal is varied, then speed can also be varied. This project uses the above principle to control the speed of the motor by varying the duty cycle of the pulse applied to it (popularly known as PWM control). The project uses input button interfaced to the processor, which are used to control the speed of motor. PWM (Pulse Width Modulation) is generated at the output by the microcontroller as per the program. The program is written in Embedded C. The average voltage given or the average current flowing through the motor will change depending on the duty cycle (ON and OFF time of the pulses), so the speed of the motor will change. A motor driver IC is interfaced to the STM32 board for receiving PWM signals and delivering desired output for speed control of a small DC motor. Further the project can be enhanced by using power electronic devices such as IGBTs to achieve speed control higher capacity industrial motors.
Arm cortex ( lpc 2148 ) based motor speed control Uday Wankar
The project is designed to control the speed of a DC and AC motor using an ARM7 LPC2148 processor. The speed of motor is directly proportional to the voltage applied across its terminals. Hence, if voltage across motor terminal is varied, then speed can also be varied. This project uses the above principle to control the speed of the motor by varying the duty cycle of the pulses applied to it, popularly known as PWM control. The project uses input button interfaced to the processor, which are used to control the speed of motor. Pulse Width Modulation is generated at the output by the microcontroller as per the program. The program is written in Embedded C.
The average voltage given or the average current flowing through the motor will change depending on the duty cycle, ON and OFF time of the pulses, so the speed of the motor will change. A motor driver IC is interfaced to the ARM7 LPC2148 processor board for receiving PWM signals and delivering desired output for speed control. Further the project can be enhanced by using power electronic devices such as IGBTs to achieve speed control higher capacity industrial motors.
Power Quality is a combination of Voltage profile, Frequency profile, Harmonics contain and reliability of power supply.
The Power Quality is defined as the degree to which the power supply approaches the ideal case of stable, uninterrupted, zero distortion and disturbance free supply.
MSEB was set up in 1960 to generate, transmit and distribute power to all consumers in
Maharashtra excluding Mumbai. MSEB was the largest SEB in the country. The generation
capacity of MSEB has grown from 760 MW in 1960-61 to 9771 MW in 2001-02. The customer
base has grown from 1,07,833 in 1960-61 to 1,40,09,089 in 2001-02.
C.S.T.P.S in contribution much in field of production of electricity. It is not only number
one thermal power station in Asia but also has occupied specific position on the international
map.
The first set was commission on August 1983 & was dedicated to nation by then PM
(late) Mrs. Indira Gandhi & second set commission on July 1984. The third & fourth units of
CSTPS under stage 2 were commissioned on the 3rd May 1985 & 8th March 1986 respectively.
The units 5 & 6 were commissioned on the 22nd March 1991 & 11th March 1992 respectively one
more units of 500MW was added to the CSTPS on making its generation to 2340 MW &
making “C.S.T.P.S.” as the giant in Power Generation of CSTPS.
With the development of industry and
agriculture, a great amount of energy such as coal, oil
and gas has been consumed in the world. Extensive
use of these fossil energies deteriorates a series of
problems like energy crisis, environmental pollution
and so on. Everybody knows that the fossil energy
reserves are finite, some day it will be exhausted.
It is possible that the world will face a
global energy crisis due to a decline in the
availability of cheap oil and recommendations to a
decreasing dependency on fossil fuel. This has led to
increasing interest in alternate power/fuel research
such as fuel cell technology, hydrogen fuel, biodiesel,
Karrick process, solar energy, geothermal energy,
tidal energy and wind. Today, solar energy and wind
energy have significantly alternated fossil fuel with
big ecological problems.
With the development of the science and
technology, power generation using solar energy and
wind power is gradually known by more and more
people. And it is widespread used in many developed
countries. The merits of the solar and wind power
generation are very obvious-infinite and nonpolluting.
The raw materials of the solar and wind
power generation derived from nature, and wind
power generation can work twenty-four hours a day,
solar power generation only works by daylight. In
addition, this kind of power generation has no
exhaust emission and there is no influence to the
nature. But it also has some shortcomings. Because
of the imperfect of the technology, equipment of the
solar and wind power generation is very expensive.
By far, it cannot be widely used.
In addition, solar and wind power
generation system affected by the changing of the
weather very much, so it has obvious defects in
reliability compared with fossil fuel, and it is difficult
to make it fit for practical use the lack of economical
efficiency .Because of these problems it needs to
increase the reliability of energy supply by
developing a system which interacts Solar and wind
energy. This kind of system is usually called windsolar
hybrid power generation system significantly
Hybrid power generation by and solar –windUday Wankar
With the development of industry and
agriculture, a great amount of energy such as coal, oil
and gas has been consumed in the world. Extensive
use of these fossil energies deteriorates a series of
problems like energy crisis, environmental pollution
and so on. Everybody knows that the fossil energy
reserves are finite, some day it will be exhausted.
It is possible that the world will face a
global energy crisis due to a decline in the
availability of cheap oil and recommendations to a
decreasing dependency on fossil fuel. This has led to
increasing interest in alternate power/fuel research
such as fuel cell technology, hydrogen fuel, biodiesel,
Karrick process, solar energy, geothermal energy,
tidal energy and wind. Today, solar energy and wind
energy have significantly alternated fossil fuel with
big ecological problems.
With the development of the science and
technology, power generation using solar energy and
wind power is gradually known by more and more
people. And it is widespread used in many developed
countries. The merits of the solar and wind power
generation are very obvious-infinite and nonpolluting.
The raw materials of the solar and wind
power generation derived from nature, and wind
power generation can work twenty-four hours a day,
solar power generation only works by daylight. In
addition, this kind of power generation has no
exhaust emission and there is no influence to the
nature. But it also has some shortcomings. Because
of the imperfect of the technology, equipment of the
solar and wind power generation is very expensive.
By far, it cannot be widely used.
In addition, solar and wind power
generation system affected by the changing of the
weather very much, so it has obvious defects in
reliability compared with fossil fuel, and it is difficult
to make it fit for practical use the lack of economical
efficiency .Because of these problems it needs to
increase the reliability of energy supply by
developing a system which interacts Solar and wind
energy. This kind of system is usually called windsolar
hybrid power generation system significantly
This paper presents Grid Solver Bot which is a self-driven vehicle capable of localizing itself in a grid and planning a path between two nodes. It can avoid particular nodes and plan path between two allowed nodes. Breadth-first search & Dijkstra's Algorithm have been used for finding the path between two allowed nodes. The searching of a block over grid is easier when the rows and columns i.e. m* n of a grid is fixed. But when the grid is dynamic or changes over time than in such situation we require a generalized algorithm for traversing over a grid. In these paper we develop an approach for searching an object and also able to avoid an obstacle which was placed in a junction (meeting point of row and column). Here, we use different algorithms like Dijkistra’s, Best first search and A star algorithms. We develop an approach to find the block with minimum shortest path with the help of priority based algorithm. The vehicle is also capable of transferring blocks from one node to another. In fact, this vehicle is a prototype of a self-driven vehicle capable of transporting passengers and it can also be used in industries to transfer different items from one place to another.
Ballarpur Industries Limited (BILT) is a flagship of the US$ 4 bnAvantha Group and India's
largest manufacturer of writing and printing (W&P) paper. The current chairman of the
company is GautamThapar, who succeeded his late uncle L.M. Thapar.
BILT's subsidiaries include Sabah Forest Industries (SFI), Malaysia's largest pulp and paper
company, and BILT Tree Tech Limited (BTTL), which runs BILT's farm forestry programme
in several states in India.
BILT has six manufacturing units across India, which give the company geographic coverage
over most of the domestic market. BILT has a dominant share of the high-end coated
paper segment in India. The company accounts for over 50% of the coated wood-free paper
market, an impressive 85% of the bond paper market and nearly 45% of the hi-bright
Maplitho market, besides being India's largest exporter of coated paper.
BILT’s acquisition of SFI in 2007 was a watershed event – it was the first overseas acquisition
by an Indian paper company. This acquisition transformed BILT into a major regional
player, and elevated the company's ranking among the global top 100.
Ensuring data storage security in cloud computingUday Wankar
Cloud computing has been envisioned as the next-generation architecture of IT enterprise.
In contrast to traditional solutions, where the IT services are under proper physical, logical and personnel controls, cloud computing moves the application software and databases to the large data centers, where the management of the data and services may not be fully trustworthy.
Moving data into the cloud offers great convenience to users since they don’t have to care about the complexities of direct hardware management.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
2. Introduction
If you fly brushless you've probably cooked a motor or two. You also probably know
there are many different types of motors. Similar motors when wound differently perform very
differently. Whether you've burned the motor up, or just want to alter performance, rewinding
is a cheap solution for a patient modeller.
Rewinding brushless motors WYE or Delta
For this tutorial, I will be using Dynam E-Razor 450 Brushless Motor
60P-DYM-0011 (2750Kv). It is a Delta wound 8T (It means 8 turns) quad wind. The winding
pattern described in this tutorial (called an ABC wind - ABCABCABC as you go around the
stator) works for any brushless motor with 9 stator teeth and 6 magnets.
Fig.2 One Coil of Motor is Completely Burned
Definition of terms
1. Stator- The metal thing that holds the wire.
2. Rotor - The rotating part of the motor. This is the can on an out runner.
3. 3. Armature - houses one winding. Each motor has a number of armatures divisible by 3.
9 and 12 are common.
4. Turns - The number of times a wire is wound around each armature
5. Delta - Most common commercial termination. Has three leads and no neutral point.
Spins 1.7 times faster than a WYE termination.
6. WYE - Less common in commercial motors. More efficient in some cases. Has 1.7
times more torque than Delta
Knowing our motor
First, obviously you'll need to remove the old wires from the motor. Be sure to count
the number of turns around the armatures as this will give you an idea of how to rewind the
motor. The direction is not particularly important at this point.
You will also want to note whether it is Delta or Wye terminated. A Wye terminated
motor will have three wires going to a central point called the neutral, which is not connected
directly to a motor lead. A delta has no such connection, just three motor wires. Often the
neutral point one WYE has a piece of heat shrink over it to keep it from shorting to the stator.
Our motor is Delta Connected.
Fig. Removing old coil
4. Starting the rebuild
Before you do anything, I highly recommend insulating the stator. Take it from the king
of stator shorts, a stator short can easily destroy your speed control. I cannot stress enough how
much easier your rewind will be if you do this.
Most stators will be already insulated, but if you cooked your motor as well as I do that
coating is toast, in which case you'll need to reinsulate it. Start by using a small hobby file to
smooth all the rough corners on your stator. I used Black Rubber Paint.
Insulating Stator
Deep stator in black paint and take off.
Wait till paint set off.
This is procedure is optional.
If you burned the motor then its mandatory.
If you want to change motor specification or your motor didn’t cooked then it is optional
Fig. Insulated Stator
5. Rewinding
Ok, now to rewind. First you must choose the number of turns you want. My motor was
8 turns, and I liked it, so I'm going to rewind it with 8 as well.
Here 8 Turns means, 8 strands of enamel coted copper wire are connected in parallel
which is wound on stator pole 8 times.
Here 36 AWG copper wire is used.
Rule of Thumb - less turns is a hotter motor and will yield a higher kv and current draw.
Go too low on this, however and the motor may not run as the speed control may not
detect the motor's position.
You'll also have to choose whether you want a Delta or WYE termination.
We are using delta connection as it was factory default.
Getting winding Pattern
Now you need the winding pattern. This motor is an 9N6P (9 stator pole, 6 magnet).
Therefore the winding pattern is ABCABCABC (each wire is wound every third tooth). This
winding pattern will not work with the very common 12N14P motor.
So before you start winding, count your magnets and stator poles and determine the winding
pattern from the list below. Lower case letters indicate winding that tooth in the reverse
direction.
9N6P-ABCABCABC
9N12P - ABCABCABC
9N8P (very rare) - AaABbBCcC
12N14P - AabBCcaABbcC <or> AaACBbBACcCB (I find this winding easier)
6. Winding Design
As we are planning on terminating Wye, mark the ending terminal of the wire. We'll need to
join the ending terminals of all three phases when it comes time to terminate the motor as
shown in following.
Start winding
Now you can start winding.
I used New-b wire (36 AVG) from nearby winding shop.
It has extra insulation to prevent shorts. I chose three strands of 36 gauge wire. So it
will be an 8 turn of 8 wire bundle wind.
Start winding with any pole you like. Go only in one direction (I went clockwise). Once
you complete the number of turns you decided on earlier, skip two poles and continue
winding the next. Repeat this process until one third of the poles are wired. It should
look like the picture below when you are done.
Here third winding is to be done.
Now before you begin with your next set of armatures, check for stator shorts with an
ohm meter (multi tester). The resistance between the wire and the metal of the stator
should be infinite (i.e. not continuity).
7. If you don't get a short, good job. Move on to the next set of armatures. If you have a
short, unwind that entire phase get a new wire and start over.
Side note: When winding, do not tug on the wires too hard. 1-2 lbs is plenty. Winding
too tight will result in a shorted winding to the stator. If you find that your wires are not
snug against your stator you can use a non-metallic object such as a broken prop, flat
carbon rod, or my favourite, a credit card to slide between the stator poles.
Do tag the start and end of winding.
Here start tag is S1 and end of 1st
winding is E1 as seen in pic on next slide.
Fig. tagging Motor terminals and checking motor winding
Ready for another set?
Ready for another set? Start with a new wire on any other pole and repeat the above
process. Make sure to test for shorts after each phase.
You'll notice the stator becomes crowded very quickly. You can clear some room with
a dull object such as a credit card.
Don’t forget to tag other winding start and end points.
8. Fig. Rewinding in final Stage
Connecting windings
Now we have 6 wire ends tagged S1,E1,S2,E2,S3,and E3.
Connect E3 S1, E1 S2 and E2 S3.
Now we have 3 end which are motor terminals A,B,C
Wire insulation & Bullet connector
Add wire insulation to copper wire. Here I used insulation sleeve of
Multicore wire to insulate them as shown in picture.
Add bullet connector to motor terminals as shown in picture.
Add heat shrink tube coating for extra strength and insulation.
Done our motor is ready.